Engine.



(I. B. DONOVAN.

ENGINE.

APPLIOATION FILED JULY 19, 1912.

1,081,21 7. Patented Dec. 9, 1913.

4 SHEETS-SHEET 1.

Y w x 1 PLANOODAPH CO-I WMHIIGTON. D. C.

J. B. DONOVAN.

ENGINE.

APPLIUATION FILED JULY 19, 1912.

1,081,21 7, Patented D6119, 1913.

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I 7 w K J. B. DONOVAN ENGINE.

APPLIOATION FILED JULY 19, 1912.

Patented Dec. 9, 1913.

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COLUMBIA PLANOGRAPH cu.,w/\sH|NOToN. D, c.

NITED STATES PATENT OFFICE.

JOHN BENJAMIN DONOVAN, F YELLOW PINE, LOUISIANA, ASSIGNOB OF ONE-HALF TO HENRY C. WALTER, OF YELLOW PINE, LOUISIANA.

ENGINE.

Specification of Letters Patent.

Patented Dec. 9, 1913.

To aZZ whom it may concern Be it known that 1, JOHN BENJAMIN 130N- ovnn, a citizen of the United States, residing at Yellow Fine, in the parish of Webster and State of Louisiana, have invented certain new and useful Improvements in Engines; and 1 do hereby declare the following to be a full, clear, and exact deseription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in engines, and it consists in the constructions, combinations and arrangements herein described and claimed.

An object of my invention is to provide an improved reciprocating engine having a minimum clearance Space and adapted for etiicient operation under all practical conditions.

A further object of my invention is to provide a compact and powerful engine adapted for use with steam, gas or other fluid medium, and is especially adapted for locon'iotives.

in the accompanying drawings forming a part of this application, and in which simi lar reference symbols indicate correspond ing parts in the several views, Figure 1 is a side elevation, partly broken away, illustrating one embodiment of my invention; Fig. 2 is a central longitudinal section of the main engine structure illustrated in Fig. 1, showing a modified form of valve gear; ll ig. 3 is a fragn'ientary section on the line 3-3 of Fig. 2; Fig. 41- is a section on the line d-1 of Fig. 2; Figs. 5, (3, '7 and 8 are diagrammatic views showing different positions of the engine mechanism.

Referring to the drawings, 1 indicates a double acting power cylinder, reciprocatingly mounted at 2 in a main engine frame 3, and having a valve chamber 4: provided with admission ports 5 and an exhaust port 6; telescoping supply and discharge pipes 7 and 8 communicating, respectively, with said valve chamber atand exhaust port 6. The main engine shaft 9 carries a double crank, comprising arms 10 provided with coaxial main crank pins 11 and inwardly-spaced crank extensions 12 rigidly secured to said pins and having their outer ends connected by an auxiliary crank pin 13. A main rod 14 is connected to the power piston 15, and provided With a bifurcated end 16 journaled on said main crank pins 11. A pair of levers 17 are pivoted to the respective arms of the bifurcated portion 16 of said main rod, and connected at their upper ends to said crank pin 13 by a link 18; links, or rods, 19 connecting the lower ends of said levers to the reciprocatingly-n1ounted power cylinder 1.

111 F 1, l have shown a reversible valve mechanism comprising a link 20 actuated by radius rods 21 connected to the arms of a pair of bell-crank levers 22; the other arms of said levers 22 being connected by links 23 to an actuating bar pivoted to the power cylinder at 26 and slidably engaging a guide 2'? pivoted at 28 on a bracket carried by the main connecting rod 1-1:. A block 30 is slidably mounted in said link 20 and connected in the usual n'ianncr with the stem 31 of any suitable valve in the valve chamber 1 for controlling the admission and exhaust ports. The link 20 is pivotally supported at 32 on a standard 33 carried by a slidably mounted bar 34:. A lever is shown for shifting said bar to adjust the link 530 for varying and reversing the travel of the valve; any usual means may be provided for locking said lever in position, such as a latch on said lever for engaging a toothed segment.

Any suitable form of air compressors 36 are actuatingly connected by rods 37 t0 cranks b8 on the main engine shaft 9, and are provided with the usual discharge pipes 39 communicating with a compressed air reservoir, or tank, 41:0. The tank 10 is shown provided with an outlet pipe 11, controlled by a hand valve $2, for conducting the compressed air to any desired point. If desired, the pipe 41 an lead to a suitable carburetor to form a combustible mixture, which can be burned in the well known man ner at substantially constant pressure to supply a gaseous actuating medium for the engine.

In Figs. 2 and 4, I have illustrated a modified valve gear, in which a bell-crank lever 13 is pivoted at 14 on a stationary standard 4-5, with its respective arms connected by links 46 and 417 to an actuating bar 48 and the stem 19 of the balanced piston valve 50; said bar 48 being pivoted to the power cylinder 1 and slidably engaging a guide 51 pivoted to a bracket 52 carried by the main connecting rod 14, as previously described. This provides a simple and efficient valve gear adapted to produce advantageously quick initial opening of the valve.

Figs. 58 are diagrammatic views, in which the relative positions of the power cylinder and piston are indicated at. A and B, respectively, for difierent angular positions of the main engine crank.

I have illustrated and described preferred and advantageous constructions, but changes could be made within the spirit and scope of my invention.

I claim 1. In an engine, the combination of a reciprocatingly-mounted power cylinder and piston, a main crank comprising a pair of parallel members provided with coaxial inwardly-extending crank pins, a pair of spaced crank extensions rigidly secured on the inner ends of said coaxial crank pins, an auxiliary crank pin connecting said spaced crank extensions, a main connecting rod pivoted to said power piston and provided with a bifurcated portion journaled on said pair of coaxial crank pins, levers pivoted on said connecting rod, a link connecting said levers to said auxiliary crank pin, and rods connecting said levers and reciprocatingly-mounted power cylinder.

2. In an engine, the combination of a recipr0catingly-mounted power cylinder and piston, a main crank comprising a pair of parallel members provided with coaxial inwardly-extending crank pins, a pair of spaced crank extensions rigidly secured on the inner ends of said coaxial crank pins, an

auxiliary crank pin connecting said spaced crank extensions, a main connecting rod pivoted to said power piston and provided with a bifurcated portion journaled on said pair of coaxial crank pins, a pair of levers pivoted between the arms of said bifurcated portion of the connecting rod, a pin connecting the outer ends of said levers, a link connecting said pin and said auxiliary crank pin, and rods connecting said levers and reciprocatin 'ly-mounted power cylinder.

3. In an engine, the combination of a re ciprocatingly-mounted power cylinder and piston, a main crank comprising a pair of parallel members provided with coaxial inwardly-extending crank pins, a pair of spaced crank extensions rigidly secured on the inner ends of said coaxial crank pins, an auxiliary crank pin connecting said spaced crank extensions, a main connecting rod pivoted to said power piston and provided with a bifurcated portion j ournaled on said pair of coaxial crank pins, levers pivoted on said connecting rod, a link connecting said levers to said auxiliary crank pin, rods connecting said levers and reciprocatingly-mounted power cylinder, a guide pivotally mounted on said main connecting rod, an actuating bar pivoted to said reciprocatingly-mounted power cylinde and extending slidably through said guide, a valve carried by said reciprocatingly-mounted power cylinder, and connections between said actuating bar and valve.

4. In an engine, the combination of a reciprocatingly-mounted power cylinder and piston, a main crank comprising a pair of parallel members provided with coaxial inwardly-extending crank pins, a pair of spaced crank extensions rigidly secured on the inner ends of said coaxial crank pins, an auxiliary crank pin connecting said spaced crank extensions, a main connecting rod pivoted to said power piston and provided with a bifurcated portion journaled on said pair of coaxial crank pins, levers pivoted on said connecting rod, a link connecting said levers to said auxiliary crank pin, rods connecting said levers and reciprocatingly-mounted power cylinder, aguide pivotally mounted on said main connecting rod, an actuating bar pivoted to said reciprocatingly-mounted power cylinder and extending slidably through said guide, a valve carried by said reciprocatingly-mounted power cylinder, and adjustable connections between said actuating bar and valve.

In testimony whereof, I aflix my signature, in presence of two witnesses.

JOHN BENGMAN DONOVAN.

Witnesses S. E. Frxonnn, IV. I. GRIFFIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

